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本篇仅用于记录自己所学知识及应用，代码仍可优化，仅供参考，如果发现有错误的地方，尽管留言于我，谢谢。

具体代码如下：

电脑端：

/*客户端部分：
*/
#include "show.h"int src;
void fun1()
{close(src);exit(0);
}int main(char **argv)
{signal(SIGINT,fun1);src = socket(AF_INET, SOCK_STREAM, 0);							//创建套接字if(src == -1){perror("创建套接字失败！\n");return -1;}int on=1;setsockopt(src,SOL_SOCKET,SO_REUSEADDR,&on,sizeof(on));			//设置端口重复使用struct sockaddr_in addr1;bzero(&addr1,sizeof(addr1));addr1.sin_family = AF_INET;addr1.sin_addr.s_addr = htonl(INADDR_ANY);						//客户端IP地址addr1.sin_port = htons(10000);									//客户端端口号int ret;ret = bind(src, (struct sockaddr *)&addr1, sizeof(addr1));		//绑定IP地址与端口号if(ret == -1){perror("绑定失败！\n");return -1;}struct sockaddr_in addr2;bzero(&addr2,sizeof(addr2));addr2.sin_family = AF_INET;addr2.sin_addr.s_addr = inet_addr("192.168.1.157");			//服务器IP地址addr2.sin_port = htons(20000);									//服务器端口号ret = connect (src, (struct sockaddr *)&addr2, sizeof(addr2));	//申请连接服务器if(ret == -1){perror("链接服务器失败！\n");return -1;}char buf[1024];printf("输入需要复制的文件名！\n");bzero(buf,1024);scanf("%s",buf);write(src, buf, strlen(buf));int fd = open(buf,O_RDONLY);while(1){bzero(buf,1024);int n = read(fd, buf, 1024);												//n为实际读取到的字节数char *tmp = buf;															//指向存放写入数据的缓冲区(实际大小)if( n == 0)																	//读取完毕break;if( n == -1 ){perror("读取文件失败！\n");break;}if( n > 0 ){int m = write(src, tmp, n); 											//m为实际写入的字节数n -= m;																	//n为未写入的字节数tmp += m;																//tmp为未写入的数据缓冲区实际大小}		}printf("读取发送完毕！\n");close(src);
}

开发板：

/*服务器部分
*/
#include "show.h"int src;
int dst;
void fun1()
{close(src);close(dst);display_close();exit(0);
}int main()
{signal(SIGINT,fun1);src = socket(AF_INET, SOCK_STREAM, 0);						//创建套接字if(src == -1){perror("创建套接字失败！\n");return -1;}int on=1;setsockopt(src,SOL_SOCKET,SO_REUSEADDR,&on,sizeof(on));		//设置端口重复使用struct sockaddr_in addr1;								bzero(&addr1,sizeof(addr1));addr1.sin_family = AF_INET;addr1.sin_addr.s_addr = htonl(INADDR_ANY);					//服务器IP地址addr1.sin_port = htons(20000);								//服务器端口号int ret;ret = bind(src, (struct sockaddr *)&addr1, sizeof(addr1));	//绑定IP地址与端口号if(ret == -1){perror("绑定失败！\n");return -1;}struct sockaddr_in addr2;bzero(&addr2,sizeof(addr2));socklen_t len = sizeof(addr2);addr2.sin_family = AF_INET;addr2.sin_addr.s_addr = inet_addr("192.168.1.156");			//客户端IP地址addr2.sin_port = htons(10000);								//客户端端口号ret = listen(src, 1);if(ret == -1){perror("链接服务器失败！\n");return -1;}dst = accept(src, (struct sockaddr *)&addr2,&len);			//接受客户端的连接申请并生成新的文件描述符int n;char buf1[100];char buf[1024];display_open();												//打开显示屏bzero(buf1,100);n = read(dst,buf1,100);int fd = open(buf1,O_RDWR|O_CREAT|O_TRUNC);while(1){bzero(buf,1024);int sum = read(dst, buf, 1024);												//n为实际读取到的字节数char *tmp = buf;															//指向存放写入数据的缓冲区(实际大小)if( sum == 0)																	//读取完毕{printf("复制完成！\n");break;}			if( sum == -1 ){perror("读取文件失败！\n");break;}if( sum > 0 ){int m = write(fd, tmp, sum); 											//m为实际写入的字节数sum -= m;																	//n为未写入的字节数tmp += m;																//tmp为未写入的数据缓冲区实际大小}		}if(strstr(buf1,".bmp")!=NULL){showbmp(buf1,1);}close(src);close(dst);display_close();											//关闭显示屏
}

#include <stdio.h>	
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdbool.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <linux/input.h>
#include <errno.h>
#include <dirent.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <error.h> 
#include <strings.h>
#include <signal.h>
#include <pthread.h>#ifndef MYHEAD_H
#define MYHEAD_Hint dst1;  														//显示屏驱动//打开显示屏
int display_open()
{dst1 = open("/dev/fb0",O_RDWR);								//打开显示屏驱动if(dst1 == -1){printf("显示屏打开失败！\n");return -1;}
}//关闭显示屏
int display_close()
{close(dst1);
}bool showbmp(char *bmppath, int n)	
{int w = 0;int h = 0;int src1 = open(bmppath , O_RDWR);lseek(src1, 18 ,SEEK_SET);								//获取BMP图片的宽w信息read(src1, &w, 4);lseek(src1, 22 ,SEEK_SET);								//获取BMP图片的高h信息read(src1, &h, 4);char bmpbuf[w*h*3];int  lcdbuf[w*h];int  tempbuf[w*h];int  lcdbuf1[] = {0};lseek(src1, 54, SEEK_SET);								//跳过BMP图片头信息字节int rubbish = (4-(w*3)%4)%4;							//BMP图片字节不能被4整除时，加入的垃圾字节数for(int i = 0; i < h; i++){read(src1, &bmpbuf[w*i*3],w*3);lseek(src1, rubbish, SEEK_CUR);						//在字节读入时，跳过垃圾字节}for(int i = 0; i < w*h; i++)							//将RGB转换成BGR{lcdbuf[i] = 0x00<<24 | bmpbuf[i*3+2]<<16 | bmpbuf[i*3+1]<<8 | bmpbuf[i*3];}for(int i = 0; i < w; i++){for(int j = 0; j < h; j++){tempbuf[(h-1-j)*w+i] = lcdbuf[j*w+i];			//BMP像素点上下反转}}//内存映射int *mmap_bmp = mmap(NULL, 800*480*4, PROT_READ|PROT_WRITE, MAP_SHARED, dst1, 0);for(int i=0; i<h/n; i++) 								//图片的高度h / 缩放倍数n{	for(int j=w*n*i,k=0; j<(w*n*i+w);j+=n,k++) 			//循环决定每行该取的像素点{//任意位置(480-h/n)/2)、(800-w/n)/2)、缩小倍数n*(mmap_bmp+800*(((480-h/n)/2)+i)+((800-w/n)/2)+k) = tempbuf[j];}}//解除内存映射munmap(mmap_bmp, 800*480*4);close(src1);}//设置节点
struct node
{char *data;struct node *next;struct node *prev;
};//初始化链表
struct node *list_init(char *newdata)
{struct node *head = malloc(sizeof(struct node));head->data = newdata;head->next = head;head->prev = head;return head;
}//创建新节点
struct node *newnode(char *newdata)
{struct node *new = malloc(sizeof(struct node));new->data = newdata;new->next = NULL;new->prev = NULL;
}//加入新节点
int addnode(struct node *new,struct node *list)
{struct node *p = list;while(p->next != list){p = p->next;}new->prev = list->prev;new->next = list;list->prev = new;new->prev->next = new;
}#endif